* Select a target from the target catalogue so that the object name and coordinates will go into the fits header.
* If taking a science image, acquire the target, and ensure that it is visible through the slit.
* If taking an arc, ensure that the arc mirror is in-beam, and the chosen required arc lamp is on.
* Select the SCIENCE exposure type after taking an arc, this will turn off the arc lamp and remove the arc mirror.
* Start the exposure with the "''Expose" '' button.
* The countdown timer will show the time remaining, and the progress bar will first show the exposure completion state, and then the readout state.